The main component of nails is a kind of protein called keratin, so if you want to have healthy nails, you must ensure that you get enough high-quality protein. When the body is sick, the nails will also be abnormal. For example, the appearance of stripes or wrinkles on nails is a signal that health is red. The texture of the fingernail is concave, indicating that there are some horizontal stripes, vertical stripes and spots on the fingernail. Traditional Chinese medicine points out that this change of nails is closely related to pathological changes such as low function of tissues and organs, destruction and atrophy of tissue structure. Longitudinal grooves appear on the nails, indicating that the circulatory system is abnormal. On the contrary, if there is a lateral groove on the nail, it means that it is a trace left by measles, or a sign of fever, or pregnancy, zinc deficiency in the body and so on. What are the reasons for the horizontal and vertical lines in nail texture? Vertical stripes: the nail surface is not smooth enough and straight lines appear, which usually appear after overwork, excessive brain use, or lack of sleep. These vertical stripes will appear obviously. If vertical stripes persist, it may be a chronic disease of internal organs. If not nursed back to health, with the development of the disease, nails will become uneven and even crack. White spots: there are a few white spots on the nails, which are usually manifestations of calcium deficiency, silicon deficiency or parasitic diseases; There are many white spots, which may be a sign of neurasthenia; Yellow spots on nails may cause diseases of the digestive system; If there are black spots on your nails, be careful. The light one is just overwork and malnutrition, and the heavy one may be a precursor of gastroptosis, gastric cancer and uterine cancer. Horizontal stripes: The horizontal stripes on the nails are the records of the lesions that have occurred. In other words, when there are horizontal lines on the nails, there must be some lesions in the body. Generally speaking, at the beginning, the stripes are only at the bottom of the nails. With the growth of nails, it gradually moves upward, indicating that the onset time is getting closer and closer. It can be seen that when fingernails have abnormal reactions, it means paying attention to health.